Hi there, Brooke. Just a data point: we use through-hole T1-3/4 (5mm) LEDs in several=20 of our products. Blue & Green. They each run with a 10k series=20 resistor from a 5V supply. That works out to about 200uA current. They are bright at that current level. dwayne At 04:50 PM 3/4/2019, Brooke Clarke wrote: >Content-Transfer-Encoding: base64Hi: > >I recently got a Magnetic Levitating Lamp that has what appears to=20 >be old fashioned lamp filaments in the bulb, but they >are really LEDs. >https://prc68.com/I/GeekStuff.html#Magnetic_Levitating_Lamp > >I expected each "filament" to be a series connection of some LEDs=20 >and so would require maybe 12 Volts to turn on. But >first checked it with a DMM in Diode mode and it lit up! >https://prc68.com/I/LED.shtml#Filament_LED >I'm not used to seeing a white LED with this low a voltage drop! You=20 >can see there are 5 LEDs in this "filament" and >they must be connected in parallel so each one is running on 200uA=20 >(diode mode is 1.0 mA)! >WHAT AM I MISSING? > >-- >Have Fun, > >Brooke Clarke >https://www.PRC68.com >http://www.end2partygovernment.com/2012Issues.html >axioms: >1. The extent to which you can fix or improve something will be=20 >limited by how well you understand how it works. >2. Everybody, with no exceptions, holds false beliefs. --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA 780-489-3199 voice 780-487-6397 fax 888-489-3199 Toll Free www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .